In article , "Eddie Haskel"
writes:

These headsets are NO LICENSE part 15 devices. Read the laws on part 15. It
says that the end user MUST ACCEPT any and all interferance to the part 15
device PERIOD. They have no guard band, no protection (no frequency
co-ordination) against other users on 154.57 and 154.600. What Booger-King
sees as malious, might be acceptable on MURS 4 and 5.

Do we know for sure which frequency was being used?

Most Burger Kings do not use 154.570/154.600. The ones I have monitored use a
customer input frequency of 154.540. This is a licensed business band
frequency, NOT a no-license MURS frequency.

Other common fast food inputs are 154.515 and 151.895. These are also licensed
business band frequencies.